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You cannot legally buy legitimate heartworm prevention in the U.S. without a vet’s authorization. This regulation exists because:

Visit your vet for an annual blood test. buy heartworm prevention online

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Avoid sites that claim "no prescription required" for U.S. customers. Buying from unverified sources carries significant risks: How to Avoid the Disasters of Counterfeit Pet Prescriptions

Vets ensure the product and dose are correct based on your pet’s exact weight and health history. 2. How to Buy Online Legally To purchase safely, follow these steps: